Structural features:
1. The static single seat structure ensures that the two-way seal is tight and reliable, and achieves zero leakage.
2. Top mounted design enables the system to be on-line maintained.
3. The cam mechanism at the lower end of the stem can provide a mechanical wedge force to ensure a continuous tight seal.
4, the opening and closing process is divided into two parts, and the lifting stroke is short and easy to operate.